Don’t think this week’s headlines about contempt of Congress and impeachment are about anything so serious as contempt of Congress or impeachment—never mind the “constitutional crisis” Speaker Nancy Pelosi declared Thursday. This is red-meat politics.

The House Judiciary Committee voted along party lines Wednesday to hold Attorney General William Barr in contempt. It demands Mr. Barr turn over an unredacted version of special counsel Robert Mueller’s report, as well as “all documents obtained and investigative materials created...